improve installation instruction for beginners
improve installation instruction for beginners

gaapt/bookyt,huerlisi/bookyt,silvermind/bookyt,hauledev/bookyt,hauledev/bookyt,wtag/bookyt,gaapt/bookyt,huerlisi/bookyt,hauledev/bookyt,gaapt/bookyt,hauledev/bookyt,wtag/bookyt,huerlisi/bookyt,silvermind/bookyt,xuewenfei/bookyt,gaapt/bookyt,xuewenfei/bookyt,xuewenfei/bookyt,wtag/bookyt,silvermind/bookyt,silvermind/bookyt